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The low energy physics of interacting quantum systems is typically understoodthrough the identification of the relevant quasiparticles or low energyexcitations and their quantum numbers. We present a quantum informationframework that goes beyond this to examine the nature of the entanglement inthe corresponding quantum states. We argue that the salient features of thequasiparticles, including their quantum numbers, locality and fractionalizationare reflected in the entanglement spectrum and in the mutual information. Weillustrate these ideas in the specific context of the $d=1$ transverse fieldIsing model with an integrability breaking perturbation.

Observing Quasiparticles through the Entanglement Lens